I
DG 1110-3-106
J. Interior Design.
Otherwise, carrels should be suitable for using a
variety of equipment and devices.
(1) Finishes.
The reflectance level of carrel surfaces should be
(2) Carrels must be designed to meet learning
minimal. Surface reflectance should not exceed 35 to
objectives, training tasks, and equipment requirements.
50 percent.
Reading carrels should be 2 by 4 feet (minimum).
Reading carrels should be grouped back-to-back or in
(2) Recommendations.
clusters. Audio-visual carrels should be 2 l/2 by 4 feet
(minimum); this may vary with the type of A-V
a. For recommendations, see Figure 4-28. For example
equipment being used and the need for a writing
color schemes called out in the figure, see the
surface. Carrels with A-V aids require acoustical
Appendix.
separation on all four sides. (Figure 4-27).
Table 4-4 Criteria for Self-Paced Instruction Classrooms.
Space Criteria
Area/Student
32 s.f.
Hot (wired) carrels
25 s.f.
Reading carrels
9 ft.
Ceiling Height
Reference: TM 5-809-1, Structural Design
Floor Loading
Environmental
Thermal
Temperature, maintained operation
50-60%
Relative humidity
10 cfm (minimum)
Outside air required/person
6 per hour (minimum)
Air changes
40 cfm (maximum)
Air movement
Positive
Air pressure
35% (minimum using NBS dust spot test)
Air filtration efficiency
Lighting
30 fc. (maintained)
General lighting level
50 fc. (maintained)
Task-carrel lighting level
70, reference: IES Lighting Handbook Applications
Visual comfort probability
Volume
70-90%
Surface reflectance: Ceiling
40-60%
Walls
30-50%
Floor
Yes
Daylighting
North or south
Window orientation
Enclosing wall sound rating:
STC 45
Between instructional spaces
STC 40
Between instructional spaces and corridors
Absorptive, NRC 50 (minimum)
Sound reflectance: Ceiling
Absorptive, NRC 25 (minimum)
Floor
Service Criteria
Electrical
110 V; 330 volt-amperes per carrel (minimum)
Power
Telephone/intercom clock control as programmed
Signal (low voltage)
Reference: paragraph 3-2g
Adaptability
4-30
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